Since the barrel is slightly twisted, does the extractor fit in the barrel notch? To correct the twist might require some machine work, beyond just rotating the barrel. I'm also working on a 'Black Forest Carbine', but I have a 16 1/2" barrel, so no SBR cert needed. Then there is always the issue of adding a forend below the barrel and attachment to the frame, without paying thousands. Although carbine stocks, other than the flat military style, have been selling for thousands on the auction sites. I think the least expensive way may be to buy a stock attachment for about 1-2 hundred, and then an old wooden stock and machine the stock for the fitting.
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